Writing a P2P Snippet sharing Extension for Visual Studio 2010 (VSX 2010)

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace Sand.Services.CodeXchange.Client.Controls
{
	/// <summary>
	/// The ExplorerBar is a Windows Explorer like control that supports sub 
	/// collapsible sub panels
	/// </summary>
	public class ExplorerBar : ScrollableControl , ISupportInitialize
	{
		private const int V_PADDING = 5;
		private const int H_PADDING = 5;

		private bool m_Initializing = false;
	
		public ExplorerBar()
		{
			Layout += new System.Windows.Forms.LayoutEventHandler(this.ExplorerBar_Layout);
			
			this.AutoScroll = true;
			//AutoCorrectMinimumExpandedHeight();
		}

		protected override void OnControlAdded(ControlEventArgs e)
		{
			base.OnControlAdded(e);

			if( e.Control is ExplorerGroup )
			{
				e.Control.Anchor = AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Right;

				((ExplorerGroup)e.Control).ExpandedChanged += new EventHandler(this.panel_IsExpandedChanged);
			}
		}

		private void panel_IsExpandedChanged(object sender, EventArgs e)
		{
			// if any control changes expansion state do a complete layout
			PerformLayout();
		}

		private void ExplorerBar_Layout(object sender, System.Windows.Forms.LayoutEventArgs e)
		{
			//only do the layou if initializing is complete
			if ( !m_Initializing )
			{
				// loop through all of the ExplorerGroup controls
				// and arrange them correctly
				for( int i = Controls.Count - 1; i >= 0; i-- )
				{
					ExplorerGroup group = Controls[i] as ExplorerGroup;

					if ( group != null )
					{
						// the first ExplorerBar get's placed at the top
						if( i == Controls.Count - 1 )
							group.Top = /*Top +*/ V_PADDING;
						else
							group.Top = Controls[i + 1].Bottom + V_PADDING;

						group.Left = H_PADDING;
						group.Width = Width - (2 * H_PADDING);

						// make room for the scroll bar
						if( VScroll )
							group.Width -= SystemInformation.VerticalScrollBarWidth;
					}
				}
			}
		}

		#region ISupportInitialize Members

		public void BeginInit()
		{
			m_Initializing = true;
		}

		public void EndInit()
		{
			m_Initializing = false;
		}

		#endregion
	}
}